Rally driver Ken Block's "Gymkhana Four" was the most shared viral video advertisement of the year, according to Mashable.com's Viral Video Chart. "Gymkhana Four," which had more than 13 million views, features the DC Shoes co-founder performing breathtaking stunts and jaw-dropping driving maneuvers in the most recent edition of the series that has totaled than 140 million views. "I was stoked ...